281 lines
6.9 KiB
C
281 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/**
|
|
* emac-rockchip.c - Rockchip EMAC specific glue layer
|
|
*
|
|
* Copyright (C) 2014 Romain Perier <romain.perier@gmail.com>
|
|
*/
|
|
|
|
#include <linux/etherdevice.h>
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_net.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/regulator/consumer.h>
|
|
|
|
#include "emac.h"
|
|
|
|
#define DRV_NAME "rockchip_emac"
|
|
|
|
struct emac_rockchip_soc_data {
|
|
unsigned int grf_offset;
|
|
unsigned int grf_mode_offset;
|
|
unsigned int grf_speed_offset;
|
|
bool need_div_macclk;
|
|
};
|
|
|
|
struct rockchip_priv_data {
|
|
struct arc_emac_priv emac;
|
|
struct regmap *grf;
|
|
const struct emac_rockchip_soc_data *soc_data;
|
|
struct regulator *regulator;
|
|
struct clk *refclk;
|
|
struct clk *macclk;
|
|
};
|
|
|
|
static void emac_rockchip_set_mac_speed(void *priv, unsigned int speed)
|
|
{
|
|
struct rockchip_priv_data *emac = priv;
|
|
u32 speed_offset = emac->soc_data->grf_speed_offset;
|
|
u32 data;
|
|
int err = 0;
|
|
|
|
switch (speed) {
|
|
case 10:
|
|
data = (1 << (speed_offset + 16)) | (0 << speed_offset);
|
|
break;
|
|
case 100:
|
|
data = (1 << (speed_offset + 16)) | (1 << speed_offset);
|
|
break;
|
|
default:
|
|
pr_err("speed %u not supported\n", speed);
|
|
return;
|
|
}
|
|
|
|
err = regmap_write(emac->grf, emac->soc_data->grf_offset, data);
|
|
if (err)
|
|
pr_err("unable to apply speed %u to grf (%d)\n", speed, err);
|
|
}
|
|
|
|
static const struct emac_rockchip_soc_data emac_rk3036_emac_data = {
|
|
.grf_offset = 0x140, .grf_mode_offset = 8,
|
|
.grf_speed_offset = 9, .need_div_macclk = 1,
|
|
};
|
|
|
|
static const struct emac_rockchip_soc_data emac_rk3066_emac_data = {
|
|
.grf_offset = 0x154, .grf_mode_offset = 0,
|
|
.grf_speed_offset = 1, .need_div_macclk = 0,
|
|
};
|
|
|
|
static const struct emac_rockchip_soc_data emac_rk3188_emac_data = {
|
|
.grf_offset = 0x0a4, .grf_mode_offset = 0,
|
|
.grf_speed_offset = 1, .need_div_macclk = 0,
|
|
};
|
|
|
|
static const struct of_device_id emac_rockchip_dt_ids[] = {
|
|
{
|
|
.compatible = "rockchip,rk3036-emac",
|
|
.data = &emac_rk3036_emac_data,
|
|
},
|
|
{
|
|
.compatible = "rockchip,rk3066-emac",
|
|
.data = &emac_rk3066_emac_data,
|
|
},
|
|
{
|
|
.compatible = "rockchip,rk3188-emac",
|
|
.data = &emac_rk3188_emac_data,
|
|
},
|
|
{ /* Sentinel */ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, emac_rockchip_dt_ids);
|
|
|
|
static int emac_rockchip_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct net_device *ndev;
|
|
struct rockchip_priv_data *priv;
|
|
const struct of_device_id *match;
|
|
phy_interface_t interface;
|
|
u32 data;
|
|
int err;
|
|
|
|
if (!pdev->dev.of_node)
|
|
return -ENODEV;
|
|
|
|
ndev = alloc_etherdev(sizeof(struct rockchip_priv_data));
|
|
if (!ndev)
|
|
return -ENOMEM;
|
|
platform_set_drvdata(pdev, ndev);
|
|
SET_NETDEV_DEV(ndev, dev);
|
|
|
|
priv = netdev_priv(ndev);
|
|
priv->emac.drv_name = DRV_NAME;
|
|
priv->emac.set_mac_speed = emac_rockchip_set_mac_speed;
|
|
|
|
err = of_get_phy_mode(dev->of_node, &interface);
|
|
if (err)
|
|
goto out_netdev;
|
|
|
|
/* RK3036/RK3066/RK3188 SoCs only support RMII */
|
|
if (interface != PHY_INTERFACE_MODE_RMII) {
|
|
dev_err(dev, "unsupported phy interface mode %d\n", interface);
|
|
err = -ENOTSUPP;
|
|
goto out_netdev;
|
|
}
|
|
|
|
priv->grf = syscon_regmap_lookup_by_phandle(dev->of_node,
|
|
"rockchip,grf");
|
|
if (IS_ERR(priv->grf)) {
|
|
dev_err(dev, "failed to retrieve global register file (%ld)\n",
|
|
PTR_ERR(priv->grf));
|
|
err = PTR_ERR(priv->grf);
|
|
goto out_netdev;
|
|
}
|
|
|
|
match = of_match_node(emac_rockchip_dt_ids, dev->of_node);
|
|
priv->soc_data = match->data;
|
|
|
|
priv->emac.clk = devm_clk_get(dev, "hclk");
|
|
if (IS_ERR(priv->emac.clk)) {
|
|
dev_err(dev, "failed to retrieve host clock (%ld)\n",
|
|
PTR_ERR(priv->emac.clk));
|
|
err = PTR_ERR(priv->emac.clk);
|
|
goto out_netdev;
|
|
}
|
|
|
|
priv->refclk = devm_clk_get(dev, "macref");
|
|
if (IS_ERR(priv->refclk)) {
|
|
dev_err(dev, "failed to retrieve reference clock (%ld)\n",
|
|
PTR_ERR(priv->refclk));
|
|
err = PTR_ERR(priv->refclk);
|
|
goto out_netdev;
|
|
}
|
|
|
|
err = clk_prepare_enable(priv->refclk);
|
|
if (err) {
|
|
dev_err(dev, "failed to enable reference clock (%d)\n", err);
|
|
goto out_netdev;
|
|
}
|
|
|
|
/* Optional regulator for PHY */
|
|
priv->regulator = devm_regulator_get_optional(dev, "phy");
|
|
if (IS_ERR(priv->regulator)) {
|
|
if (PTR_ERR(priv->regulator) == -EPROBE_DEFER) {
|
|
err = -EPROBE_DEFER;
|
|
goto out_clk_disable;
|
|
}
|
|
dev_err(dev, "no regulator found\n");
|
|
priv->regulator = NULL;
|
|
}
|
|
|
|
if (priv->regulator) {
|
|
err = regulator_enable(priv->regulator);
|
|
if (err) {
|
|
dev_err(dev, "failed to enable phy-supply (%d)\n", err);
|
|
goto out_clk_disable;
|
|
}
|
|
}
|
|
|
|
/* Set speed 100M */
|
|
data = (1 << (priv->soc_data->grf_speed_offset + 16)) |
|
|
(1 << priv->soc_data->grf_speed_offset);
|
|
/* Set RMII mode */
|
|
data |= (1 << (priv->soc_data->grf_mode_offset + 16)) |
|
|
(0 << priv->soc_data->grf_mode_offset);
|
|
|
|
err = regmap_write(priv->grf, priv->soc_data->grf_offset, data);
|
|
if (err) {
|
|
dev_err(dev, "unable to apply initial settings to grf (%d)\n",
|
|
err);
|
|
goto out_regulator_disable;
|
|
}
|
|
|
|
/* RMII interface needs always a rate of 50MHz */
|
|
err = clk_set_rate(priv->refclk, 50000000);
|
|
if (err) {
|
|
dev_err(dev,
|
|
"failed to change reference clock rate (%d)\n", err);
|
|
goto out_regulator_disable;
|
|
}
|
|
|
|
if (priv->soc_data->need_div_macclk) {
|
|
priv->macclk = devm_clk_get(dev, "macclk");
|
|
if (IS_ERR(priv->macclk)) {
|
|
dev_err(dev, "failed to retrieve mac clock (%ld)\n",
|
|
PTR_ERR(priv->macclk));
|
|
err = PTR_ERR(priv->macclk);
|
|
goto out_regulator_disable;
|
|
}
|
|
|
|
err = clk_prepare_enable(priv->macclk);
|
|
if (err) {
|
|
dev_err(dev, "failed to enable mac clock (%d)\n", err);
|
|
goto out_regulator_disable;
|
|
}
|
|
|
|
/* RMII TX/RX needs always a rate of 25MHz */
|
|
err = clk_set_rate(priv->macclk, 25000000);
|
|
if (err) {
|
|
dev_err(dev,
|
|
"failed to change mac clock rate (%d)\n", err);
|
|
goto out_clk_disable_macclk;
|
|
}
|
|
}
|
|
|
|
err = arc_emac_probe(ndev, interface);
|
|
if (err) {
|
|
dev_err(dev, "failed to probe arc emac (%d)\n", err);
|
|
goto out_clk_disable_macclk;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_clk_disable_macclk:
|
|
if (priv->soc_data->need_div_macclk)
|
|
clk_disable_unprepare(priv->macclk);
|
|
out_regulator_disable:
|
|
if (priv->regulator)
|
|
regulator_disable(priv->regulator);
|
|
out_clk_disable:
|
|
clk_disable_unprepare(priv->refclk);
|
|
out_netdev:
|
|
free_netdev(ndev);
|
|
return err;
|
|
}
|
|
|
|
static int emac_rockchip_remove(struct platform_device *pdev)
|
|
{
|
|
struct net_device *ndev = platform_get_drvdata(pdev);
|
|
struct rockchip_priv_data *priv = netdev_priv(ndev);
|
|
int err;
|
|
|
|
err = arc_emac_remove(ndev);
|
|
|
|
clk_disable_unprepare(priv->refclk);
|
|
|
|
if (priv->regulator)
|
|
regulator_disable(priv->regulator);
|
|
|
|
if (priv->soc_data->need_div_macclk)
|
|
clk_disable_unprepare(priv->macclk);
|
|
|
|
free_netdev(ndev);
|
|
return err;
|
|
}
|
|
|
|
static struct platform_driver emac_rockchip_driver = {
|
|
.probe = emac_rockchip_probe,
|
|
.remove = emac_rockchip_remove,
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
.of_match_table = emac_rockchip_dt_ids,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(emac_rockchip_driver);
|
|
|
|
MODULE_AUTHOR("Romain Perier <romain.perier@gmail.com>");
|
|
MODULE_DESCRIPTION("Rockchip EMAC platform driver");
|
|
MODULE_LICENSE("GPL");
|